package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;

    /**
     * 新增套餐，同时需要保存套餐和菜品的关联关系
     * @param setmealDto
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作，
        this.save(setmealDto) ;

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        setmealDishes.stream().map((item) -> {
            item.setSetmealId (setmealDto.getId());
            return item;
        }).collect(Collectors.toList());
        //保存套餐和菜品的关联信息，操作setmeal dish, 执行insert操作
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Transactional
    public void removeWithDish(List<Long> ids) {

            //select count(*) from setmeal where id in (1,2,3) and status = 1
            //查询套餐状态，确定是否可用删除
            LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper();
            queryWrapper.in(Setmeal::getId,ids);
            queryWrapper.eq(Setmeal::getStatus,1);
            int count = this.count(queryWrapper);
            if(count > 0) {
                //如果不能删除，抛出一个业务异常
                throw new CustomException("套餐正在售卖中，不能删除");
            }
               //如果可以删除，先删除套餐表中的数据---setmeal
               this.removeByIds(ids);

                // delete from setmeal_dish where setmeal_id in (1,2,3)
                LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
                lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
                //删除关系表中的数据--—-setmeal_dish
                setmealDishService.remove (lambdaQueryWrapper);


    }
}
